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7:40 P.M. UPDATE: Were you riding on MARC or VRE as the thunderstorms moved through Wednesday? What was the ride like and how long was your trip? Post a comment below or send a message to transportation@washpost.com.
7:35 P.M. UPDATE: MARC 856 on the Camden Line will depart Washington 10 to 15 minutes late due to equipment delays.

6:30 P.M. UPDATE:

-- Flood warnings issued by CSX for the Camden Line mean both eastbound and westbound trains will operate at reduced speeds and run at least 10 to 15 minutes late.

6:16 P.M. UPDATE: MARC 855 is running about 23 minutes late due to signal problems between Dorsey and St. Denis.

6:15 P.M. UPDATE: MARC 850 on the Camden Line is running about 17 minutes late departing Greenbelt, according to the MTA. There was a late equipment problem and there are speed restrictions due to flood warnings issued by CSX, which owns the tracks.

4 P.M. UPDATE:

MARC Train 533, which was supposed to head to Washington, terminated in Baltimore. Look for Train 435 instead, which is supposed to make all stops, according to the MTA.

1:50 P.M. UPDATE:

MARC Train 429 on the Penn Line has been canceled. Amtrak Train 125 (departing Baltimore at 2;13 p.m. ) will pick up passengers from Baltimore, BWI, Odenton and New Carrollton, according to the Maryland Transit Administration. The next southbound MARC train will depart Baltimore at 2:45 p.m. (Train 431).

12:08 P.M. UPDATE: Virginia Railway Express says Norfolk Southern has canceled floods restrictions that affected rail lines Wednesday morning. Officials said they do not anticipate delays because of the issue this evening.

10:35 A.M. UPDATE:
Penn Line train 416 (departing Washington at 10:30 a.m.) is canceled due to the terminated train 419. The next train heading north will be train 418 (departing Washington at 11:15 a.m.).

9:50 A.M. UPDATE:
Following up on our earlier update (from Nancy Szokan), Penn Line train 419 has been terminated. Amtrak train 181 will pick up passengers at Halethorpe, BWI and Odenton. Train 521 will handle Bowie and Seabrook.

9:42 A.M. UPDATE:
The Post's Nancy Szokan writes that she is on an Amtrak train that stopped south of Baltimore to pick up passengers from a broken down MARC train.

ORIGINAL POST:
MARC Penn Line train 419 is having mechanical problems south of the West Baltimore station. It is experiencing a 30 minute delay. Train 521 is the next one heading southbound.